高通量抗污染碳量子点<strong>/</strong>聚砜纳米复合分离膜的制备

doi:10.11901/1005.3093.2020.058

材料研究学报

2020, Vol. 34

Issue (10): 761-769 DOI: 10.11901/1005.3093.2020.058

研究论文

本期目录 | 过刊浏览

高通量抗污染碳量子点/聚砜纳米复合分离膜的制备

陈斌¹, 张佳露¹, 张岩¹, 赵海超², 朱丽静²(

)

1.沈阳化工大学材料科学与工程学院沈阳 110142
2.中国科学院宁波材料与工程技术研究所海洋材料及相关技术重点实验室宁波 315201

Carbon Dots Incorporated Polysulfone Nanocomposite Membranes with High Water Fux and Fouling Resistance

CHEN Bin¹, ZHANG Jialu¹, ZHANG Yan¹, ZHAO Haichao², ZHU Lijing²(

)

1. School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
2. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

引用本文:

陈斌, 张佳露, 张岩, 赵海超, 朱丽静. 高通量抗污染碳量子点/聚砜纳米复合分离膜的制备[J]. 材料研究学报, 2020, 34(10): 761-769.
Bin CHEN, Jialu ZHANG, Yan ZHANG, Haichao ZHAO, Lijing ZHU. Carbon Dots Incorporated Polysulfone Nanocomposite Membranes with High Water Fux and Fouling Resistance[J]. Chinese Journal of Materials Research, 2020, 34(10): 761-769.

全文: PDF(12800 KB) HTML

摘要:

先以4-氨基水杨酸(ASA)为原料发生水热反应合成碳量子点(CDs)，随后将其共混分散在铸膜液中用非溶剂诱导相分离法制备了PSF/CDs纳米复合膜。透射电子显微镜(TEM)观测和傅里叶变换红外光谱(FTIR)证实，CDs具有小尺寸和大量亲水基团的特点。使用水接触角分析(WCA)、扫描探针显微镜(SPM)和扫描电子显微镜(SEM)对分离膜进行了表征，发现纳米复合膜具有比原始膜更好的亲水性和更多的孔洞，从而使分离膜具有更高的通量和抗污染性能。PSF/CDs膜的通量回复率(FRR)超过90%，总污染率(Rt)低于60%，且可逆型污染为主要污染源。CDs含量(质量分数)为2%的复合膜整体效果最佳。具有更强抗污染能力的纳米复合膜，其水通量甚至为纯PSF膜的3倍。

关键词 ：有机高分子材料, 聚砜, 碳量子点, 纳米复合膜, 抗污染性, 亲水性

Abstract：

Carbon dots (CDs) were synthesized from 4-aminosalicylic acid (ASA) by a hydrothermal carbonization technique and then incorporated into the membrane casting solution. Then polysulfone/carbon dots (PSF/CDs) nanocomposite membranes were prepared by non-solvent induced phase separation. The results of transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) show that CDs with a lot of hydrophilic groups had been successfully synthesized. Water contact angle analysis (WCA), scanning probe microscope (SPM) and scanning electron microscope (SEM) were used to characterize all membranes. It could be found that nanocomposite membranes have better hydrophilicity and water flux than the original membrane. Therefore, the anti-fouling performance of the modified membranes had also been improved. Flux recovery rate (FRR) of the fabricated PSF/CDs membrane is higher than 90%, total fouling ratio (Rt) is less than 60%, and the reversible fouling played a dominant role during the fouling process. When the CDs content (mass fraction) is 2%, the overall effect of the membrane is the best with comprehensive performances such as separation efficiency, separation effect, and antifouling ability etc. The water flux of the nanocomposite membranes with stronger anti-fouling ability is even 3 times that of the plain PSF membrane.

Key words： organic polymer materials polysulfone carbon quantum dots nanocomposite membrane fouling resistance hydrophilicity

收稿日期: 2020-02-24

ZTFLH:

TQ028.5

基金资助:国家自然科学基金(51603214);宁波市科学技术局基金(2018A610110);中国科学院“百人计划”研究项目(Y60707WR04)

作者简介: 陈斌，男，1963年生，博士，教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.058 或 https://www.cjmr.org/CN/Y2020/V34/I10/761

图1 CDs的合成和相转化成膜过程分离膜内部变化示意图

图2 CDs的TEM照片和在365 nm紫外光线下的荧光图像，CDs和ASA的红外光谱以及粒径分布和XPS能谱

表1 ASA和CDs的元素含量

图3 ASA和CDs的XPS元素精细谱图

图4 M0, M0.5, M5分离膜的显微红外谱图、XPS广谱以及不同组分分离膜的实物图

表2 不同组分分离膜的元素含量

图5 分离膜表面的SEM照片

表3 分离膜表面的平均孔径和孔隙率

图6 SPM表面粗糙度示意图

图7 分离膜的截面结构SEM图像

图8 不同分离膜试样的水接触角

图9 通量测试FW1, FBSA, FW2结果、BSA分子截留率RBSA及回复率FRR测试结果、总污染率(Rt)、可逆污染率(Rr)和不可逆污染率对比(Rir)以及可逆污染比(Rr/Rt)与不可逆污染比(Rir/Rt)的对比

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